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include(CheckCSourceCompiles)
include(CheckCXXSourceCompiles)
# We need some extra FAIL_REGEX patterns
# Note that CHECK_C_SOURCE_COMPILES is a misnomer, it will also link.
SET(fail_patterns
FAIL_REGEX "argument unused during compilation"
FAIL_REGEX "unsupported .*option"
FAIL_REGEX "unknown .*option"
FAIL_REGEX "unrecognized .*option"
FAIL_REGEX "ignoring unknown option"
FAIL_REGEX "warning:.*ignored"
FAIL_REGEX "warning:.*is valid for.*but not for"
FAIL_REGEX "warning:.*redefined"
FAIL_REGEX "[Ww]arning: [Oo]ption"
)
#The regex patterns above are not localized, thus LANG=C
SET(ENV{LANG} C)
MACRO (MY_CHECK_C_COMPILER_FLAG flag)
STRING(REGEX REPLACE "[-,= +]" "_" result "have_C_${flag}")
SET(SAVE_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
SET(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${flag}")
CHECK_C_SOURCE_COMPILES("int main(void) { return 0; }" ${result}
${fail_patterns})
SET(CMAKE_REQUIRED_FLAGS "${SAVE_CMAKE_REQUIRED_FLAGS}")
ENDMACRO()
MACRO (MY_CHECK_CXX_COMPILER_FLAG flag)
STRING(REGEX REPLACE "[-,= +]" "_" result "have_CXX_${flag}")
SET(SAVE_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
SET(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${flag}")
CHECK_CXX_SOURCE_COMPILES("int main(void) { return 0; }" ${result}
${fail_patterns})
SET(CMAKE_REQUIRED_FLAGS "${SAVE_CMAKE_REQUIRED_FLAGS}")
ENDMACRO()
FUNCTION(MY_CHECK_AND_SET_COMPILER_FLAG flag_to_set)
# At the moment this is gcc-only.
# Let's avoid expensive compiler tests on Windows:
IF(WIN32)
RETURN()
ENDIF()
STRING(REGEX REPLACE "^-Wno-" "-W" flag_to_check ${flag_to_set})
MY_CHECK_C_COMPILER_FLAG(${flag_to_check})
MY_CHECK_CXX_COMPILER_FLAG(${flag_to_check})
STRING(REGEX REPLACE "[-,= +]" "_" result "${flag_to_check}")
FOREACH(lang C CXX)
IF (have_${lang}_${result})
IF(ARGN)
FOREACH(type ${ARGN})
SET(CMAKE_${lang}_FLAGS_${type} "${CMAKE_${lang}_FLAGS_${type}} ${flag_to_set}" PARENT_SCOPE)
ENDFOREACH()
ELSE()
SET(CMAKE_${lang}_FLAGS "${CMAKE_${lang}_FLAGS} ${flag_to_set}" PARENT_SCOPE)
ENDIF()
ENDIF()
ENDFOREACH()
ENDFUNCTION()
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